fixed clippy warnings in npv_sensitivity.rs

Author: showmyth

src/financial/npv_sensitivity.rs

@@ -30,7 +30,7 @@ mod tests {
     use super::*;
     #[test]
     fn test_npv_sensitivity() {
-        let cashflows = vec![-1000.00, 400.00, 400.00, 400.00];
+        let cashflows = [-1000.00, 400.00, 400.00, 400.00];
         let rates = vec![0.05, 0.1, 0.2];
         let expected = vec![89.30, -5.26, -157.41];
         let out = npv_sensitivity(&cashflows, &rates);